Protecting-jacket for valve-stems.



S. A. SWBNS'ON.

PROTECTING JACKET FOR VALVE STEMS. APPLICATION TILED MAY 27, 1914.

1,127,101 Patented Feb.. 2, 1915.

WITNESSES INVENTOR (3? 6. 5M By Ms ATTORNEYS SANFORD A. SWENSON, 0F GRQTON, SOUTH DAKOTA.

rnomcrine-moxnr FOR vnavns rums.

the art to which it appertains to make and use the same.

My invention has for its object to provide a protectin jacket for valve stems, and it is especially adapted for use in connection with exhaust valves of internal combustion engines, to prevent carbon from burning onto the valve stem, and to protect the same from heat and grease, which are the cause of so much valve trouble in the breaking and sticking of the same.

To the above ends, generally stated, the invention consists of the novel .devices and combinations of devices hereinafter described and defined in the claims.

Referring to the drawing, the single figure is a view, partly in vertical section and partly in elevation, jacket applied in exhaust valve of en 'ne. v

he numeral 1 indicates the cylinder of an internal combustion engine surrounded by a water jacket 2. Leading from the cylinder 1 is an exhaust port or chamber 3, having formed therein a valve seat 4. Mounted on the seat 4 and normally closing the exhaust-port 3, is an exhaust valve 5 of the puppet type, with its depending stem worklng in a guide or bearing 7. This bearing is ormed with upper and lower hubs 8 and 9, respectively, the former of which projects into the exhaust port 3. A volute spring 10 surrounds the hub 9, is compressed between the engine casin and a collar 11, and normally and yiel ingly holds said exhaust valve closed.

The 'above described parts have been illustrated for the purpose of showing the improved protecting jacket applied in working position, and may be of the standard or any desired construction. Any suitable means may be employed for actuating the showing the protecting working position to the an internal combustion Specification of Letters Patent.

Application filed May 27, 1914. serial No. 841,250.

in the county of Brown and State Patented Fehfi, iota."

. exhaust valve 5, and, for the purpose of this case, it is not thought illustrate the same.

On the exhaust valve 5, at .the junction of the valve stem 6 therewith, is an externally threaded boss 12, which carries the protecting jacket, which is conical in form. This protectingrcasing or jacket 13 is internally threaded, at its upper end, and 'screwed onto the boss 12 for common movenecessary to ment with the exhaust valve 5, surrounds the exposed portion of the valve stem 6 within the exhaust port 3, and works telescopically over the hub 8.

en the exhaust valve 5 is seated, the jacket 13 completely covers the hub 8, and when the said valve is open, said jacket still covers the upper end portion of the hub 8, thus protecting the valve stem from heat and grease, from burning thereon. It is, of course, understood that the improved protecting jacket or casing may take various forms and be applied in different manners, de-

pendin on the construction of the engine and va ve.

What I claim is 1. The combination with an internal combustion engine having a stem-equipped valve, of a protecting jacket for the stem of said valve, spaced apart therefrom.

2. The combination with an internal -combustion enginehaving an exhaust port and an exhaust valve of the puppet type, of a protecting jacket for that portion of the stem of said valve exposed within said exhaust port, said jacket being spaced apart from said stem.

3. The combination with an internal combustion engine having an exhaust port,-

an exhaust valve port, and a bearing havand preventing carbon Bit ing a hub extending into said exhaust port,

in which the stem of said exhaust valve works, of a pr'otectmg jacket surrounding that portion of the stem of said exhaust valve exposed within said exhaust port and spaced apart therefrom and also surrounding the hub of said bearing. 7

4. The combination with an internal combustion engine having an exhaust port, an exhaust valve, of the puppet type, and a bearing having a hub extending into said exhaust port, in which the stem of said In testimon whereof I afiix my signature exhaust valve Works, of a protecting jacket in presence 0 two witnesses.

applied to said exhaust valve surrounding I that portion of the stem of said exhaust SANFORD SWENSON' 5 valve exposed within said exhziust port, Witnesses:

spaced apart therefrom and working tele- O'rro SWENBON, scopically over the hub of said bearing. W. B. Mama. 

